JP2003247499A - Drain discharger for water pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that drain water or the like leaked out from a mechanical seal of a water pump is undesirably directly discharged outside from a communicating hole. <P>SOLUTION: Sealing is carried out in the mechanical seal 15 by pressing a driven ring 22 against a seat ring 16 by a spring 20, which however allows a portion of cooling water to leak from the relevant portion. The leaked drain has conventionally been discharged outside by providing a drain hole 25 and a through hole 26, instead of which a resin cap 27 having a hole is provided to the relevant portion. The cap 27 consists of a cap body 30 having a small hole 38 on the side wall thereof, and a cylindrical fixing portion 31 protruding from the body. Slits 35 extending to the cap body are formed at the tip of the cylindrical fixing portion 31 to form a plurality of engaging parts 36. An engaging protrusion 33 that extends to the outer periphery is formed at the tip of each engaging part 36. In order to carry out fixing, the tip of the cylindrical fixing portion 31 is pressed into the drain hole 25 or the like from outside. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water pump for circulating cooling water for an automobile engine, which leaks from a mechanical seal provided around a shaft for driving the water pump. The present invention relates to a drain pump for a water pump for discharging drain and water vapor to the outside so as not to enter the water pump pulley bearing. 2. Description of the Related Art As a water pump for circulating cooling water for an automobile engine, for example, a water pump as shown in FIG. 3 is used. That is, in this water pump, an impeller 42 is attached to one end of a shaft 41, a driven pulley 43 driven by an engine is attached to the other end, and an intermediate portion of the shaft 41 is It is supported by the device 45. [0003] In the bearing device 45 part, the shaft 4
Two rows of track grooves 47, 4 formed on the surface of
7, balls 51 are arranged between two rows of raceway grooves 50 formed on the inner surface of the bearing support portion 48 of the housing 44, and the balls 51 are held at equal intervals by a retainer. Further, seals 52 and 53 are provided on the side portions of each ball row to constitute a bearing device for a water pump pulley. Furthermore, a mechanical seal 55 is provided on the outer periphery of the shaft 41 on the side where the impeller 42 is fixed, between the shaft 41 and the cylindrical inner peripheral surface 54 of the housing 44. In this mechanical seal 55, a seat ring 56 is provided in an annular recess formed in the center of the impeller 42, and
The outer peripheral ring portion of a guide cylinder 57 having a U-shaped cross section is press-fitted and fixed to the inner peripheral surface 54 of the cylinder, and a bellows 61 urged by a spring 60 is provided outside the inner peripheral ring portion 58 of the guide cylinder 57. The seat ring 66 is sealed by contacting the axial end face of the driven ring 62 supported by the bellows 61 with the opposed end face of the seat ring 66. [0005] With such a mechanical seal 55,
The cooling water in the pump chamber 63 in which the impeller 42 is housed is prevented from leaking to the outside as much as possible, and in particular, is prevented from flowing out to the bearing side supported by the bearing support 48 of the housing 44 adjacent to the pump chamber 63. are doing. However, in the mechanical seal 55, sealing is performed between both end faces of the seat ring 56 and the driven ring 62, and the sealing property is not always sufficient, and a contact portion between the two is lubricated by cooling water. Cooling water inevitably seeps out of this contact surface. Therefore, the cooling water leaked from the mechanical seal 55 or the vaporized water which has become a gaseous state flows from the gap between the inner peripheral ring portion 58 of the guide cylinder 57 and the outer periphery of the shaft 41 to the bearing device 45 side. Will leak out. When there is no portion where such cooling water or water vapor is discharged to the outside, the cooling water or steam flows directly to the bearing device 45 side, and although the bearing device 45 is provided with the seal 52, it gradually permeates into the bearing device 45. Is inevitable. When the cooling water enters the bearing device 45 as described above, the bearing device 45 is corroded at an early stage, the function of the water pump is impaired, and the engine is seriously damaged. Therefore, a drain hole 65 for cooling water communicating with the outside and a drain hole 66 for discharging water vapor are provided in the housing 44 between the mechanical seal 55 and the bearing device 45.
As a result, the cooling water or steam leaked from the mechanical seal 55 is discharged to the outside of the housing 44 as described above, and is prevented from flowing to the bearing device 45 as much as possible. [0008] Nevertheless, the cooling water leaking from the mechanical seal 55 causes the shaft 41 rotating at high speed.
And may penetrate the bearing device 45 side along the outer peripheral surface of the bearing. As a countermeasure against such cooling water, for example, a slinger 67 is fixed to the outer periphery of the shaft 41 at the seal 52 of the bearing device 45, and the cooling water transmitted along the outer peripheral surface of the shaft 41 is guided to the radial wall of the slinger 67. The cooling water is scattered by the centrifugal force of the radial wall of the slinger 67 rotating at high speed to prevent the cooling water from entering the bearing and to scatter the scattered cooling water into the drain hole 6.
5 and the holes 66 are discharged to the outside. As described above, in a water pump for circulating cooling water for an automobile engine, drain and water vapor leaking from a mechanical seal portion provided around a shaft for driving the water pump are formed. Although, the amount of the cooling water leaking from the mechanical seal portion is gradually reduced due to the improvement of the sealing performance, the above-mentioned structure is such that the amount of the cooling water leaks from the drain hole 65 and the through hole 66 formed in the housing. It cannot be completely eliminated due to the sealing characteristics of the mechanical seal, and the cooling water leaks from the drain hole 65 and the drain hole 66 to the outside,
It may cause the surrounding equipment to get wet and adversely affect it. When the cooling water transmitted along the outer periphery of the shaft is scattered by the slinger 67 as described above, the scattered cooling water is drained to the drain hole 65 as much as possible.
Since it is preferable that the holes are directly discharged to the outside from the holes 66, these holes are arranged close to the outer peripheral edge of the radial wall of the slinger 67. In that case, drain hole 65
It is also conceivable that the cooling water is scattered to the outside through the holes 66, which is not preferable because the cooling water is scattered to nearby devices. Also, when steam is blown out from the hole, the surrounding devices are adversely affected. Further, if the above-mentioned drain hole 65 and the above-mentioned drain hole 66 are provided in the housing, since this portion is exposed to the outside air, a negative pressure is generated at the moment when the shaft stops, so that dust or fine Sand and the like may enter, and it is not preferable that these accumulate around the bearing. As a countermeasure, in order to prevent the direct ejection of steam into the outlet portion of the hole 66 formed in the housing 44 as described above, and to prevent dust or small sand from directly entering from the outside, the outer periphery of the housing is further prevented. In order to prevent water flowing along the surface from flowing through the holes 56, a cover such as an eave is formed integrally with the housing so as to protrude from the housing. However, in order to integrally mold such a protruding portion with the housing, the mold becomes complicated and the cost becomes high. In addition, simply forming a protruding portion to cover the cutout hole has little effect of preventing intrusion of dust and fine sand from the outside. It has also been proposed to provide a reservoir bag outside the hole 66 and store the temporarily leaked steam or cooling water inside the reservoir bag, but the means for attaching the reservoir bag is cumbersome. In addition, there is a problem that the peripheral configuration becomes complicated and it takes time to fix the storage bag. Accordingly, the present invention provides a water pump for circulating cooling water for an automobile engine, in which drain and water vapor leaking from a mechanical seal portion provided around a shaft for driving the water pump are discharged from a drain hole or a drain hole of a housing to the outside. Inexpensive so that it can be discharged without adversely affecting external devices, etc., and the housing can be easily attached with discharge prevention means without special processing. It is a main object to provide a drain discharge device for a water pump. In order to solve the above-mentioned problems, the present invention provides a container-shaped main body having a small hole in a side wall and a cylindrical mounting portion protruding from the main body. A plurality of locking portions are formed on the cylindrical mounting portion by slits extending in the axial direction from the distal end, and a locking projection protruding in an outer peripheral direction is provided at a distal end of each locking portion. A water pump drain discharge device characterized in that the portion is inserted from the outside into a communication hole formed in the housing of the water pump, the retaining projection is used to prevent the hole from coming off, and the perforated cap is attached to the housing. is there. Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a drain discharge device for a water pump according to the present invention, and a water pump to which this device is applied is the same as that shown in FIG. That is, in the water pump, the impeller 2 is attached to one end of the shaft 1 as described above, the driven pulley 3 driven by the engine is attached to the other end, and the intermediate portion is connected to the housing 4 as described above. Are supported by a bearing device 5. The bearing device 5 includes two rows of raceway grooves 7 formed on the surface of the large diameter portion 6 of the shaft 1, and two rows of raceway grooves 1 formed on the inner surface of the bearing support 8 of the housing 4.
Each of the balls 11 is arranged between the balls 11 and 0, and the balls 11 are held at equal intervals by a retainer. In addition, seals 12 and 13 are provided on the side of each ball row to constitute a water pump pulley bearing device as a whole. Further, a mechanical seal 15 is provided on the outer periphery of the shaft 1 on the impeller 2 fixed side, between the shaft 1 and the cylindrical inner peripheral surface 14 of the housing 4. This mechanical seal 15
As described above, the seat ring 16 is provided in the annular recess formed in the center of the impeller 2, and the outer ring portion 18 of the guide cylinder 17 having a U-shaped cross section is press-fitted into the inner circumferential surface 14 of the housing 4. A bellows 21 urged by a spring 20 is disposed outside the inner peripheral ring portion 19 of the guide cylinder 17, and an axial end face of a driven ring 22 supported by the bellows 21 is fixed to the seat. Sealing is performed by contacting the opposed end surface of the ring 16. Since the cooling water leaks from the mechanical seal 15 as described above, the housing 4 between the mechanical seal 15 and the bearing 5 is provided with a drain hole 25 for cooling water and a drain hole 26 for discharging water vapor. And
In the present invention, a perforated cap 27 made of resin as described later is attached to the drain hole 25 and the drain hole 26 to collect these drains and water vapor and discharge them to the outside. A slinger 23 is fixed to the outer periphery of the shaft 1 at the seal 12 of the bearing device 5.
The cooling water transmitted along the outer peripheral surface of the slinger is guided to the radial wall of the slinger 23, and the cooling water is scattered by the centrifugal force of the radial wall of the slinger rotating at a high speed, thereby preventing the cooling water from entering the bearing and scattering. The cooling water thus discharged is discharged to the outside through the drain holes 25 and the drain holes 26, and these are collected and discharged into the perforated cap 27 in the same manner as described above. As shown in FIG. 2A, the perforated cap 27 has a structure in which a cylindrical mounting portion 31 is integrally formed with a resin-made container-shaped cap body 30 as shown in a perspective view of one embodiment. A diametrically expanding locking projection 33 is formed at the tip 32 of the cylindrical mounting portion 31, and an end surface of the locking projection 33 is inclined from the center of the cylindrical mounting portion 31 toward the outer periphery. The tapered portion 34 is provided. Also, four slits 3 in the figure are provided from the tip 32 side toward the cap body 30 side.
5 are formed, thereby forming four locking portions 36 in the figure. The locking portions 36 can be deformed in the bending direction by the elasticity of the resin material. The length of the cylindrical mounting portion 31 is as shown in FIG. 1, and as shown in an enlarged sectional view of the main part in FIG.
The thickness of the housing is set to be larger than the thickness of the housing at the drain hole 25 and the hole 26 formed at the same time. The length of the slit 35 formed in the cylindrical mounting portion 31 is set to be equal to or less than the thickness of the housing at the portion where the perforated cap 27 is mounted, but if the length of the slit 35 is short, the slit 35 is formed. Since the length of the locking portion 36 becomes short and the amount of elastic deformation generated by a predetermined force becomes small, it becomes difficult to attach the material.
Set the appropriate length in consideration of the width etc. However, if the attachment is too easy, it is easy to come out due to vibration or the like, so that it is set to have appropriate rigidity. In the illustrated embodiment, a small hole 38 is formed in the side surface 37 of the cap body 30. The small hole 38 can be arranged at an arbitrary position on each wall of the cap main body 30.
When it is mounted on the cap 5, the drain water may be arranged at a position where the drain water flowing into the cap body 30 from the drain hole 25 does not immediately flow out. The size can also be set as appropriate, for example, set to about 4 mm. The shape of the cap body 30 can be arbitrarily set in consideration of a space for mounting the cap body 30 and the like. When using the perforated cap 27 having the above configuration, the tapered portion 34 at the tip 32 of the cylindrical mounting portion 31 is brought into contact with the drain hole 25 or the cutout hole 26, and the cap body 30 is strongly pushed in. Force is tapered part 3
4, the four locking portions 36 are deformed so as to be pushed inward against the elastic force thereof, and the locking protrusions 33 are formed as shown by two-dot chain lines in FIG. 25 or the hole 26. In this state, cap 2 with more holes
7, the locking projection 33 enters the inside of the housing 4, and as shown by the solid line in FIGS.
6 returns to its original shape, and the locking projection 33 is hooked on the peripheral edge of the drain hole 25 or the hole 26, so that it is prevented from falling off. When using the perforated cap 27 mounted in this manner, when the driven pulley 3 is rotated by the belt driven by the engine, the shaft 1 supported on the housing 4 by the bearing 5 rotates. ,
The rotation of the impeller 2 of the water pump circulates the cooling water. At this time, the cooling water leaked from the mechanical seal 15 flows through the inside of the housing 4 as described above, and is stored in a perforated cap 27 attached to a drain hole 25 provided at a lower portion of the housing 4. At this time, even if the perforated cap 27 moves in the axial direction of the hole in the drain hole 31 due to vibration or the like, since the slit 35 is always in communication with the inner surface of the housing, the drain flowing through the inner surface of the housing is always replaced by the perforated cap. 27 can flow down. If the amount of the drain that has flowed down to the perforated cap 27 is small, it gradually evaporates during the engine stop period, and the small hole 38 of this perforated cap 27 or the small hole 38 of the perforated cap 27 provided for the perforated hole 26. Evaporates to the outside and disappears. When the amount of drain is large, the inside of the perforated cap 27 is gradually filled, and when the cap reaches the height of the small hole 38, it flows out from the small hole 38 to the outside. The drain that overflows from this small hole 38 is once a perforated cap 2
The drain is not scattered from the small hole 38 because it is stored in the inside 7. Therefore, as described above, the bearing 5
When the cooling water transmitted along the surface of the shaft is splashed off by the slinger provided in the hole, even if the cooling water directly enters the perforated cap 27, it does not scatter as it is from the small hole 38 to the outside. On the other hand, the water vapor leaked from the mechanical seal 15 flows into the perforated cap 27 attached to the hole 26 and evaporates from the small hole 38. When the water vapor is cooled and liquefied inside, the drain flows down again into the housing, but the drain enters the perforated cap 27 provided in the drain hole 25 and is stored in the same manner as described above. Further, as described above, even if the drain splashed by the slinger provided on the bearing 5 directly enters the perforated cap 27, the drain does not scatter to the outside from the small hole 38 as it is. The perforated cap 2 which performs the above operation
7, the small hole 38 is formed in the side wall, so that muddy water or the like that propagates through the housing flows in or drip from the hole as in the case of facing up like a conventional hole. Disappears. In the above embodiment, the drain holes 2
Although an example in which a perforated cap 27 of the same shape is provided in the hole 5 and the punched hole 26 is shown, in order to surely perform the respective operations and to fit the gap around the mounting, each is changed to an appropriate shape. Therefore, they may be formed into different shapes. By using such a perforated cap, it is possible to make the device more inexpensive than a conventional device having an eaves-like projection on the aluminum alloy housing itself, and a more reliable effect of preventing drain and water vapor from scattering can be expected. it can. In addition, although it is possible to integrally form relatively fine projections and the like on the aluminum material, it is conceivable to form the housing from an iron-based metal plate such as a steel plate in order to further reduce the weight. In such a case, since it is difficult to integrally mold a complicated shape, it is particularly effective as a countermeasure for preventing the scattering of the drain using the perforated cap according to the present invention as described above. The present invention is constructed as described above. In a water pump for circulating cooling water for an automobile engine, a drain leaking from a mechanical seal provided around a shaft for driving the water pump is provided. When discharging water vapor to the outside through the drain hole or drain hole of the housing, if the amount of drain is small, the drain stored in the perforated cap will evaporate during engine stoppage etc., and even if the amount is large, Since the gas is discharged after being collected in the perforated cap, the scattered drain does not adversely affect external devices and the like. In addition, a perforated cap can be easily attached without special processing to the housing, and since the perforated cap is made of resin, it can be formed into an arbitrary shape. Can be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an embodiment of the present invention. FIGS. 2A and 2B are diagrams showing a perforated cap used in the embodiment, wherein FIG. 2A is a perspective view thereof, and FIG. FIG. 3 is a sectional view of a conventional example. [Description of Signs] 1 Shaft 2 Impeller 3 Driven pulley 4 Housing 5 Bearing device 8 Bearing support portions 12, 13 Seal 14 Cylindrical inner peripheral surface 15 Mechanical seal 16 Seat ring 17 Guide cylinder 18 Outer ring portion 19 Inner ring portion 20 Spring 21 Bellows 22 Follower Ring 23 Slinger 25 Drain Hole 26 Drain Hole 27 Perforated Cap 30 Cap Body 31 Cylindrical Mounting 33 Locking Projection 34 Taper 35 Slit 36 Locking 37 37 Side Wall 38 Small Hole

Claims (1)

Claims: 1. A container having a side wall with a small hole formed therein and a cylindrical mounting portion protruding from the main body, forming a perforated cap, wherein the cylindrical mounting portion has an axial line extending from a distal end thereof. A plurality of locking portions are formed by slits extending in the direction, and a locking projection protruding in an outer peripheral direction is provided at a tip of each locking portion, and the cylindrical mounting portion is provided outside a communication hole formed in a housing of the water pump. The drainage discharging device for a water pump, characterized in that the drainage discharging device is inserted into the housing, the stopper is used to prevent the cap from coming off, and the perforated cap is attached to the housing.